// TODO(b/74949947): turn this back into an error status
      LOG(WARNING) << mutation_warning;
      session->graph->sessions[session].clear();
    }

    const auto num_nodes = graph.num_node_ids();
    if (session->last_num_graph_nodes < num_nodes) {
      // TODO(nolivia): check this on a subset of the graph instead of all of
      // it.
      status->status = graph::ValidateGraphHasNoCycle(session->graph->graph);

MASTER_KEY: $(yaml-quote "${MASTER_KEY_BASE64:-}")
KUBECFG_CERT: $(yaml-quote "${KUBECFG_CERT_BASE64:-}")
KUBECFG_KEY: $(yaml-quote "${KUBECFG_KEY_BASE64:-}")
KUBELET_APISERVER: $(yaml-quote "${KUBELET_APISERVER:-}")
NUM_NODES: $(yaml-quote "${NUM_NODES}")
STORAGE_BACKEND: $(yaml-quote "${STORAGE_BACKEND:-etcd3}")
STORAGE_MEDIA_TYPE: $(yaml-quote "${STORAGE_MEDIA_TYPE:-}")
ENABLE_GARBAGE_COLLECTOR: $(yaml-quote "${ENABLE_GARBAGE_COLLECTOR:-}")

                                     node->name(),
                                     "' is missing attribute 'index'");

    auto index = attr->i();
    const int num_nodes = nodes->size();
    if (num_nodes < index + 1) nodes->resize(index + 1);

    if ((*nodes)[index].node != nullptr)
      return errors::InvalidArgument(node->type_string(), " node '",